Investigation of Heterogeneous Catalytic Reactions by the in situ 1H NMR Microimaging
I.В V.В Koptyug1, A.В V.В Kulikov2, A.В A.В Lysova1,2,3, V.В A.В Kirillov2, V.В N.В Parmon2 and R.В Z.В Sagdeev1
1International Tomography Center, Siberian Branch of the Russian Academy of Sciences,
Ul. Institutskaya 3A, Novosibirsk 630090 (Russia),
E-mail: koptyug@tomo.nsc.ru
2G. K. Boreskov Institute of Catalysis, Siberan Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 5, Novosibirsk 630090 (Russia), 3Novosibirsk State University,
Ul. Pirogova 2, Novosibirsk 630090 (Russia)
Страницы: 109-116
Аннотация
The NMR microimaging is used for the first time as an in situ method to study two model three-phase heterogeneous catalytic reactions with strong exothermicity. It is shown for the α-methylstyrene hydrogenation that in the course of the reaction, two domains coexist inside the catalyst grain which differ in the liquid phase content. The 2D maps of the liquid distribution in the course of this reaction are obtained. The reaction of the hydrogen peroxide decomposition at moderate activity of the catalyst and the H2O2 concentrations in the range of (0.03–3) M is shown to occur only in a thin layer near the catalyst surface. The influence of the medium inhomogeneity on the behaviour of the Belousov – Zhabotinsky chemical oscillator reaction is investigated as well.
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